<template>
    <div class="app-container">
        <el-form label-width="120px">
            <el-form-item label="信息描述">
                <el-tag type="info">excel模版说明</el-tag>
                <el-tag>
                    <i class="el-icon-download" />
                    <a :href="'/static/subject.xlsx'">点击下载模版</a>
                </el-tag>

            </el-form-item>

            <el-form-item label="选择Excel">
                <el-upload ref="upload" :auto-upload="false" :on-success="fileUploadSuccess" :on-error="fileUploadError"
                    :disabled="importBtnDisabled" :limit="1" :action="BASE_API+'/edu/subject/addSubject'" name="file"
                    accept="application/vnd.ms-excel">
                    <el-button slot="trigger" size="small" type="primary">选取文件</el-button>
                    <el-button :loading="loading" style="margin-left: 10px;" size="small" type="success"
                        @click="submitUpload">{{ fileUploadBtnText }}</el-button>
                </el-upload>
            </el-form-item>
        </el-form>
    </div>
</template>

<script>
export default {

    data() {
        return {
            BASE_API: process.env.BASE_API, // 接口API地址
            fileUploadBtnText: '上传到服务器', // 按钮文字
            importBtnDisabled: false, // 按钮是否禁用,
            loading: false
        }
    },
    methods: {
        submitUpload() {
            this.fileUploadBtnText = '正在上传'
            this.importBtnDisabled = true
            this.loading = true
            this.$refs.upload.submit()
        },

        fileUploadSuccess(response) {
            if(response.success == true){
                this.fileUploadBtnText = '导入成功'
                this.loading = false;
                this.$message({
                    type: 'success',
                    message: response.message
                })
            }
        
        },

        fileUploadError(response) {
            this.fileUploadBtnText = '导入失败'
            this.loading = false
            this.$message({
                type: 'error',
                message: '导入失败'
            })
        }
    }
}
</script>